Los Angeles police are investigating how a veteran department firearms instructor shot and wounded another officer in the left hamstring at a training facility this week when he mistook a loaded handgun for a mock version of the weapon.

The incident occurred about 4 p.m. Monday at the Edward M. Davis Training Facility in Granada Hills as the two instructors, who train new recruits, were transitioning from teaching a class with live firearms to an exercise using mock handguns that look and sound like real weapons but do not discharge bullets.